B3134

Code

Generic B — Body

Remote Keyless Entry Receiver Circuit Fault

Brand: Generic

Type: B — Body

Views: UK: 12 EN: 11 RU: 8

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Dead or weak key fob battery
Faulty RKE receiver module or integrated BCM receiver
Open/shorted wiring between RKE receiver and BCM or antenna
Damaged or disconnected antenna/antenna coax
Poor ground or low supply voltage to receiver
Software or EEPROM fault in BCM

Symptoms

Key fob commands (lock/unlock, remote start, panic) do not operate
Intermittent operation or reduced effective range of key fob
Security/immobilizer warning or unexpected alarm behavior
No RF activity seen by diagnostic tool when pressing fob
Possible multiple stored RKE faults or BCM communication errors

What to check

Verify key fob battery voltage and operation; try a known-good spare fob
Scan vehicle for related DTCs in BCM and security modules
Inspect fuses and power supply to receiver/BCM; check grounds
Visually inspect RKE receiver/antenna wiring and connectors for damage or corrosion
Move vehicle away from possible RF interference sources and retest
Check for recent aftermarket installs (alarms, remote starters, RF devices)

Signal parameters

Typical RF carrier bands: 315 MHz or 433 MHz (vehicle-specific); some regions use 868 MHz
Receiver supply: vehicle battery voltage (~9–14 V) with good ground
Data output: digital pulses or serial messages from receiver to BCM (0–12 V or logic level depending on module)
Expected behavior: short RF burst(s) when fob button pressed; repeated packets while button held
If diagnosing with scope: look for repeated packet envelopes and consistent amplitude on antenna feed or receiver data line

Diagnostic algorithm

Confirm symptom with operator: which functions fail and whether failure is constant or intermittent.
Test key fob(s): measure battery voltage, swap or use confirmed-good fob to rule out transmitter fault.
Scan for DTCs across BCM, immobilizer, and related modules; record freeze frame if present.
Verify receiver/BCM power and ground at the module connector; check relevant fuses and wiring for continuity.
Inspect antenna and coax or antenna harness for damage and secure connections; repair any corrosion or loose terminals.
Attempt to capture RF activity: use an RF detector/sniffer near antenna/receiver while pressing fob; if no RF is seen from a good fob, suspect receiver input/antenna or severe interference.
Monitor data/communication line from receiver to BCM with scope or diagnostic tool while pressing fob to confirm packet arrival at BCM.
If intermittent, wiggle test wiring/connectors and retest to reproduce fault; check for water intrusion or broken pins.
Check for aftermarket RF sources or accessories; disconnect them and retest.
If wiring and antenna are good and receiver shows no response, replace or reprogram the receiver/BCM per service procedures. Relearn or reprogram keys as required.
After repair, clear DTCs and verify correct operation over time and range; confirm no recurrence.

Likely causes

Weak/failed key fob battery or defective key fob
Faulty receiver module (separate unit or inside BCM)
Damaged antenna or antenna connection
Power supply (fuse, wiring, ground) to receiver is open or low
Intermittent connector/contact causing intermittent reception

Fault status

⚠️ Status

Remote Keyless Entry Receiver Circuit Fault detected. Check key fob, receiver power/ground, antenna and wiring; may cause loss of remote locking/unlocking and related functions.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours